Indusind Bank — Getting many collection calls

I have lodge complaint for cancellation of Card.i have not paid minimum amount because i have changed my existing card to EMI card .but joining fees only ten thousand and it was included in this month amount thats why i want to cancel my card, but i have not get any feedback from bank, but am getting calls only from collection department, after telling before cancellation of card i will not pay amount, but they r harresing by calling